The Laguna Floating Thermometer is a fast and convenient way to keep you informed about the water temperature. The thermometer includes an easy viewing window with large temperature indications for quick readings. It comes with a handy anchoring cord and is designed to float on the water surface for easy access. It records temperatures between 30°F to 120°F (0 to 50°C). Its light, all-plastic construction is fish friendly and will not rust.